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beehivehunter, 6 years agoA while back I happen to stumble on to a Spec-Tru Color Reference Guide System that works really well on determining correct colors for insulators.
Where I purchased mine no longer has them for sale. Keep an eye for onr of these color guides for they work very well.
Thank You for your kind comments.

john duprey, 5 years agoI have a 151 with some interesting points hope you can help as I do not find it in the book. First the H.G. CO is HG with a half inch space between G and Co with a period in the middle. Period follows the Co but is about one quarter inch behind the O. It also has RDP on both the inner and outer skirt The Pat and dating are correct and match the book . I compared to my other 151 that has sdp. I also noted that all in the book are sdp or rd. Do I have a odd ball here and what might it be worth thanks jd